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What is the charge of proton, neutron and electron?
What is the mass in amu of proton, neutron and electron?
What are the symbols of Sodium, Magnesium, Carbon, Potassium, Oxygen?
What are the symbols of Iron, Copper, Nitrogen, Hydrogen, Sulfur?
What are the name of the following elements? Na, K, S, Ca, Mg, H
What are the name of the following elements? Ca, Fe, Zn, P, Cu, N, O
How many elements are their in the Periodic Table?
118
What are the name of the following elements? Li, Cl, F, Ne, Ar
Fill in the blanks, known that the atomic mass is 13, electron is 11
Fill in the blanks, known that the number of neutron is 12, the electronic structure is 2, 8, 1
Atom is a very _____piece of matter that could not be ______.
Atom is a very small piece of matter that could not be divided.
Outermost shell is the shell _____ from the nucleus of the atom.
Outermost shell is the shell farthest from the nucleus of the atom.
Element are arranged in the order of ______ the proton number.
Element are arranged in the order of increasing the proton number.
Period: The number of ________
Period: The number of electron shells
Group: The number of ________
electrons in the outermost shell
_____ is a particle of at least 2 atoms bonded together.
Molecule is a particle of at least 2 atoms bonded together.
